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LAARS Rheos RHCV - Install and Operating Manual User Manual

Page 40

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LAARS Heating Systems

Page 40

SECTION 7.

Maintenance

WARNING

Disconnect all power to the appliance before

attempting any service to the appliance. Contact

with electricity can result in severe injury or death.

7.1 System Maintenance

1. Lubricate the system water-circulating pump, if

required, per the instructions on the pump.

2. If a strainer is employed in a pressure reducing

valve or the piping, clean it every six months.

3. Inspect the venting system for obstruction or

leakage at least once a year. Periodically clean

the screens in the vent terminal and combustion

air terminal (when used).

4. Keep the appliance area clear and free from

combustible materials, gasoline, and other

flammable vapors and liquids.

5. If the appliance is not going to be used for

extended periods in locations where freezing

normally occurs, it should be isolated from the

system and completely drained of all water.

6. Low water cutoffs, if installed, should be

checked every 6 months. Float type low water

cutoff should be flushed periodically.

7. Inspect and clean the condensate collection and

disposal system yearly.

8. When a means is provided to neutralize

condensate, ensure that the condensate is being

neutralized properly.

9. Inspect flue passages, and clean with brushes/

vacuums, if necessary. Sooting in flue passages

indicates improper combustion. Determine the

cause and correct.

10. Inspect the vent system and air intake system,

and ensure that all joints are sealed properly. If

joints need to be resealed, completely remove

existing sealing material, and clean with alcohol.

Apply new sealing material, and re-assemble.

7.2 Appliance Maintenance and

Component Description

Only genuine Laars replacement parts should be

used.

Caution

Label all wires prior to disconnection when servicing

controls. Wiring errors can cause improper and

dangerous operation. Verify proper operation after

servicing.

Caution

Should any odor of gas be detected, or if the gas

burner does not appear to be functioning in a

normal manner, close main shutoff valve, do not

shut off switch, and contact your heating contractor,

gas company, or factory representative.

Gas Type

Air Orifice

Gas Orifice

Differential

Differential

Natural

4.0 to 4.5" W.C.

4.0 to 4.5" W.C.

(1.0 to 1.1kPa)

(1.0 to 1.1kPa)

Propane

4.5 to 5.0" W.C.

4.5 to 5.0" W.C.

(1.1 to 1.2kPa)

(1.1 to 1.2kPa)

Note: Long runs of vent or combustion air piping may

reduce the air and gas differential pressures. This is

acceptable, as long as the pressures are within 0.1"

(0.025kPa) w.c. of each other.

Table 10. Air and Gas Orifice Differentials at Full Fire.

6.3 Shutting Down the Rheos

1. Switch off the main electrical disconnect switch.

2. Close all manual gas valves.

3. If freezing is anticipated, drain the Rheos and

be sure to also protect building piping from

freezing.

This step to be performed by a qualified

service person.

6.4 To Restart the Rheos

If drained, follow Section 6.1 in this manual

for proper filling and purging.

1. Switch off the main electrical disconnect switch.

2. Close all manual gas valves.

3. WAIT FIVE (5) MINUTES.

4. Set the aquastat or thermostat to its lowest

setting.

5. Open all manual gas valves.

6. Reset all safety switches (pressure switch,

manual reset high limit, etc).

7. Set the temperature controller to the desired

temperature setting and switch on electrical

power.

8. Burner will go through a prepurge period and

ignitor warm-up period, followed by ignition.

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